The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a MRI study

The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus - a MRI study. Sphenoidal surgery and FESS surgery generally has low risk and complications rate. However the surgeries are technically challenging due to complex relati...

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Main Author: Zamrah, Suzieta
Format: Thesis
Language:English
Published: 2013
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Online Access:http://eprints.usm.my/56956/1/Suzieta%20bt%20Zamrah%20-%20e%2024.pdf
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spelling my-usm-ep.569562023-02-15T04:44:39Z The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a MRI study 2013 Zamrah, Suzieta R735-854 Medical education. Medical schools. Research RC71-78.7 Examination. Diagnosis Including raiography The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus - a MRI study. Sphenoidal surgery and FESS surgery generally has low risk and complications rate. However the surgeries are technically challenging due to complex relationship of neurovascular structures namely internal carotid artery (ICA) and optic nerve . This study illustrates radiological anatomy relationship of the sphenoid sinus with these neurovascular structures. To evaluate certain anatomical parameters of internal carotid artery and optic nerve in relation to the lateral wall of sphenoid sinus based on modified MRI protocol of pituitary gland. In this prospective study of 30 patients carried out from December 2009 until August 2010, the following modified MRI protocols of pituitary were performed. Sagittal, axial and coronal view in fat suppression sequences using slice thickness of 1. 7 mm and spacing of 0.5 mm were performed. The smallest and largest distance between both ICA were measured on coronal and axial views , and their respective locations were determined for each patient. Indentations of optic nerve or internal carotid artery on sphenoid sinus were also evaluated. Sphenoid sinus pneumatisation pattern was studied. Association between internal carotid artery indentation with age, gender and types of sphenoid sinus pneumatisation were determined. Most common type of sphenoid sinus pneumatisation was sellar type (66.7%), followed by post sellar type (26.7%) and presellar type (6.7%). No concha! type noted. The mean of smallest distance between right and left internal carotid arteries were (7.00 ± 4.66 mm (coronal view) and 6.30 ± 4.70 mm (axial view); in which majority (73.3%) located in cerebral/ supraclinoid segment and 26.7% in cavernous. The mean of largest distances were 28.20 ± 5.90 mm (coronal view) and 28.43 ±5.7 mm (axial view). Of this, 46.7% located in cavernous segment, petrous (40.0 %) and cerebral/supraclinoid (13.3%). Indentations of optic nerve and internal carotid artery were noted in 46.7% and 66.7% of patients respectively. There was significant association between type of sphenoid sinus pneumatisation with internal carotid artery indentation ( p = 0.003). No statistically significant association between internal carotid artery indentation with age and gender. Internal carotid artery and optic nerve indentations were noted in 46.7% and 66.7% of the patients respectively in our study. The smallest distance between right and left internal carotid atiery can be as narrow as 6.30 mm, most commonly located in the cerebral/supraclinoid segment. Both these anatomical variants predispose the structures for injury and should be acknowledged to the surgeon before the surgery. 2013 Thesis http://eprints.usm.my/56956/ http://eprints.usm.my/56956/1/Suzieta%20bt%20Zamrah%20-%20e%2024.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Sains Perubatan
institution Universiti Sains Malaysia
collection USM Institutional Repository
language English
topic R735-854 Medical education
Medical schools
Research
R735-854 Medical education
Medical schools
Research
spellingShingle R735-854 Medical education
Medical schools
Research
R735-854 Medical education
Medical schools
Research
Zamrah, Suzieta
The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a MRI study
description The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus - a MRI study. Sphenoidal surgery and FESS surgery generally has low risk and complications rate. However the surgeries are technically challenging due to complex relationship of neurovascular structures namely internal carotid artery (ICA) and optic nerve . This study illustrates radiological anatomy relationship of the sphenoid sinus with these neurovascular structures. To evaluate certain anatomical parameters of internal carotid artery and optic nerve in relation to the lateral wall of sphenoid sinus based on modified MRI protocol of pituitary gland. In this prospective study of 30 patients carried out from December 2009 until August 2010, the following modified MRI protocols of pituitary were performed. Sagittal, axial and coronal view in fat suppression sequences using slice thickness of 1. 7 mm and spacing of 0.5 mm were performed. The smallest and largest distance between both ICA were measured on coronal and axial views , and their respective locations were determined for each patient. Indentations of optic nerve or internal carotid artery on sphenoid sinus were also evaluated. Sphenoid sinus pneumatisation pattern was studied. Association between internal carotid artery indentation with age, gender and types of sphenoid sinus pneumatisation were determined. Most common type of sphenoid sinus pneumatisation was sellar type (66.7%), followed by post sellar type (26.7%) and presellar type (6.7%). No concha! type noted. The mean of smallest distance between right and left internal carotid arteries were (7.00 ± 4.66 mm (coronal view) and 6.30 ± 4.70 mm (axial view); in which majority (73.3%) located in cerebral/ supraclinoid segment and 26.7% in cavernous. The mean of largest distances were 28.20 ± 5.90 mm (coronal view) and 28.43 ±5.7 mm (axial view). Of this, 46.7% located in cavernous segment, petrous (40.0 %) and cerebral/supraclinoid (13.3%). Indentations of optic nerve and internal carotid artery were noted in 46.7% and 66.7% of patients respectively. There was significant association between type of sphenoid sinus pneumatisation with internal carotid artery indentation ( p = 0.003). No statistically significant association between internal carotid artery indentation with age and gender. Internal carotid artery and optic nerve indentations were noted in 46.7% and 66.7% of the patients respectively in our study. The smallest distance between right and left internal carotid atiery can be as narrow as 6.30 mm, most commonly located in the cerebral/supraclinoid segment. Both these anatomical variants predispose the structures for injury and should be acknowledged to the surgeon before the surgery.
format Thesis
qualification_level Master's degree
author Zamrah, Suzieta
author_facet Zamrah, Suzieta
author_sort Zamrah, Suzieta
title The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a MRI study
title_short The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a MRI study
title_full The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a MRI study
title_fullStr The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a MRI study
title_full_unstemmed The relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a MRI study
title_sort relevant anatomical parameters of the internal carotid artery and optic nerve in relation to lateral wall of sphenoid sinus-a mri study
granting_institution Universiti Sains Malaysia
granting_department Pusat Pengajian Sains Perubatan
publishDate 2013
url http://eprints.usm.my/56956/1/Suzieta%20bt%20Zamrah%20-%20e%2024.pdf
_version_ 1776101183671238656